Fiesta since it has Kingdom quests. Eventhough I like the style of flyff more, I had more fun playing fiesta since the grind to me wasn't as bad, and there was more to do. Also I had no expectations for fiesta

flyff is cool, but all to do is grind lvl 10 new class, grind, lvl 20, hoverboard ,grind, lvl 50 or 60 I think, job change, grind, lvl 99....pvp?
At least in fiesta there are KQ's which breaks up the grind a bit, plenty of quests, and sub skills like crafting, scroll making, potion making which were cool and easy to use add-ons. Also pvp.
But to me personally both games ain't that great. I just like fiesta a bit more then flyff.
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A world of sin and shadows....delightful.
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Currently Playing:DDR(various), DDO Unlimited (PC), Fallout 3 (360), Batman: Arkahm Asylum (360), Shadow Hearts: Covenent (PS2), Yakuza 2(PS2).
Wants to Play: Nothing to be honest.
Waiting For: TSW(PC),SW:TOR(PC),Huxley(PC), Dragon Age Origins(360),Borderlands (360).